That info I don't have. The most shallow (closest to the deck) were the ones that hit. He did not take measurements from the deck to the bowl of the valve yet. What he did was on the deepest ones, cut just enough to add the five angles. Then he set the rest to within about .003-.005" of each other.
Do you have any idea as to what depth they should be if measured to the bowl? Or what the minimum installed spring tension should be? These are ST220 springs over 01 3L valves if that helps in the depth measurement. Better yet, what's the installed height from the spring seat to the top of the valve stem? That's probably a better route to go provided the measurement from the keepers to the top of the stems measure close to each other.
I'm not sure if they have these "specialized gauges" but this is Dart Heads/Blocks so I'm guessing they would since that's all they do.
How do I go about finding thicker aftermarket gaskets if that need happens to be necessary? I was just using Ford 3L gaskets.